/*
 * Copyright (C) 2009 M. Hautle.
 * 
 * This file is part of TrackedBean.
 * 
 * TrackedBean is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any later version.
 * 
 * TrackedBean is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along with TrackedBean. If not, see <http://www.gnu.org/licenses/>.
 */
package ch.trackedbean.validator.defaultValidators;

import java.util.regex.*;
import ch.trackedbean.validator.engine.*;

/**
 * Validator for {@link Email}.<br>
 * 
 * @author M. Hautle
 */
public class MailValidator extends AbstractValidator {
	/** Valid "char". */
	private static String ATOM = "[^\\x00-\\x1F^\\(^\\)^\\<^\\>^\\@^\\,^\\;^\\:^\\\\^\\\"^\\.^\\[^\\]^\\s]";

	/** Valid domain name. */
	private static String DOMAIN = "(" + ATOM + "+(\\." + ATOM + "+)+";

	/** Valid ip name. */
	private static String IP_DOMAIN = "\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\]";

	/** The compiled regex. */
	private static final Pattern MAIL_PATTERN = Pattern.compile("^" + ATOM + "+(\\." + ATOM + "+)*@" + DOMAIN + "|" + IP_DOMAIN + ")$",
			Pattern.CASE_INSENSITIVE);

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void init(Configuration cfg) {
		error = new ErrorDescription(cfg.getString(Email.ATTR_MESSAGE, Email.DEFAULT_MESSAGE));
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected boolean isValid(Object value) {
		if (!(value instanceof String))
			return true;
		final String mail = (String) value;
		return mail.length() == 0 || MAIL_PATTERN.matcher(mail).matches();
	}
}
